Art of making rings for cutting rubber and other material



C. M. LOGAN. ART OF MAKING RINGS FOR CUTTING RUBBER AND OTHER MATERIAL.

APPLICATION FILED JUNE 10. 1920.

1,407,470. Patented Feb. 21, 1922.

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*ooftrn M. Logan, orjnnwenx, new 'annsnifjassronon To HELLER BROTHERS COMPANY, or NEWARK, unwannsnv, A ooIa-PonATmNor NEW JERSEY.

ART OF MAKING-RINGS ron'ouTTrNa nuBBEn AND OTHER MATERIAL.

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Ton whom it mag icmwern:

qBe it known that I, COLIN M. LOGAN, a citizenaofthe' United States, and aresident of the city of Newark, county of Essex, and State ofNew Jersey, have invented a new and useful Improvementin the Art of Maln ing Rings for Cutting Rubber and other Material, of whichthe following is a full, clear, and exact description. f

li ly invention relates toimprovernents in the art of forming cutting devices or mills in which rotary cutting cylinders or rings are used, which ringsare provided with cutting, tearing, or-la cerating surfaces to engagethe'rubber or other material and cut or tear it into shreds or the likes Rings of this kind are made of forged steel and are generally mounted, onmandrils. or otherv supports so as to turn in a mill or machine, and the material to be desiccated or out up is held against its cutter. To this end the rings or cylinders have their cutting faces provided with teeth to engage the material to be shredded or cut, and because of the ring construction it has been found necessary to produce these teeth by hand, and

V they are generally made somewhat after the style of the teeth of fcoarserasp. The consequence is that rings of this character forged and then cut by hand are very expensive. On the other hand there are machines for cutting-similar teeth on flat strips such as'files, rasps, and the like, and I have found that by cuttinga fiat strip of forged steel on a conventional or other machine, or even by hand, and ,then shaping the fiat piece into a ring, a great saving in the expense is effected. This is-because first, of

the saving in hand labor,andnext, because a forged ring 'is vmore expensive than the flat strip of steel. In carrying out my invention along the above lines, I first take a piece of suitable fiat steel and shape its edges so that it can be grasped by the edgesto be bent without injuring the teeth subsequently formed thereon, then cut the surface of the strip so as to produce the necessary teeth. The strip is then grasped by the edges and bent around a former so as to give it the desired shape, and the ends are left in close abutment, and may if desired be welded electrica'lly or otherwise. Thus it will be seen that I form a ring very expeditiously and econ mically which is to all intents as good Specification of LettersPatent. Patgnted Feb. 21, 1922. Application filed June 10, 1920. Serial no. 387,899.- if

as the ring formed from a steel forging, and

with teeth subsequently cut thereon. All of which will be more clearly understood from the descriptionwhich follows.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar reference characters indicate corresponding parts in all the v ews.

,t Figure 1 is a broken plan view of a simple means of bending the hat strip to the desired ring shape.

Figure 2 is a sectional side elevation of such a structure, both views showing the strip from which the ring is formed.

. Figure 3 is aperspective view of the com plete cutting ring, and

Figure 4 is a. broken perspective of the strip of stock from which the ring is made.

The ring 10 is a conventional forged ring for the purpose stated, and it has its outer surface provided with teeth which as stated are of the same general kind as those on a coarse rasp. The strip 11 I have shown with beveled edges 12 so that after the teeth are formed thereon the strip can be gripped by the edges and bent to shape without injuring the teeth. A beveled edge serves this purpose perfectly, but it will be understood that so far as my invention is concerned the edges might be flanged or otherwise shaped, so long as they could be grasped with sufficient power to bend the material so as to make it unnecessary to apply pressure to the cutting face thereof.

' In Figures 1 and 2 I have shown a some what crude but effective means of bending the strip 11 to shape, and it will be understood of course that the drawings merely illustrate a means of accomplishing this result, but so far as my invention is concerned, very many other devices might be used if desired, as the invention lies in the art of making the cutting rings and not in the means for making them. As shown, however, the structure has a former 13 of cylindrical shape about which the strip 11 is bent, and this is mounted on a base 14, but can be supported in any desired way or position.

Fastening means is provided to secure the tween the arms carries a movable block 18 which lies between thefcross piece and the former, this block having a recessed middle portion, andhavingits inner end portions beveled as shown at 19 so as to engage the beveled edges 12 9f the strip 11. The block can be forced up snugly against the vformer 13 by screws 20 which extend through the cross piece '17 and abut With the block, or other suitable means can be substituted.

For bending the strip 11 to shape a yoke 21' which is provided with a suitable'lever or handle 22 can be used, and thisis shaped toliook on over the members 23' at the ends of the former, which members are centrally located so that the yoke can-be reing thebending device, is passed through a machine, and the teeth out upon its face, or the teeth can be "cut in any other preferred way, afterwhichthe strip is heated, one end "fastened to the former as shown, and the b'endlng device is then, turned around so as to force the strip 11 firmly against the former 13 and wrap it around the same so that the two ends of the strip 11 shall come into close abutment. When the ring coolSI these ends. will stay in position, but it is better to weld them together so that the ring may be solid'. conventional ring for the purpose stated,

I and I lay no claim to this, but my invention lies in the method of forming the ring.

It will be understood that other means ca1ibe provided for securing the flat strip. 11 to the former and bending it around the same, and t'or engaging the strip by its edges.

The ring itself is the Iclaim:-- r v 1. The improvement in the art of forming rings having cutting-or abrading faces,

which consists infirstcu'tting theiface o'f'a flat strip of material, and then'graspingthe strip in a manner to leave the: teeth uninjured and bending the material around a former to give it the desired shape, 2. The mprovement in the art of form ing aring with a cutting OTiIbIfl-(llIlg-ffiCB,

which consists in first producing the cutting face upon a flat strip" of material, then grasping-the material by its edges and bending it round' aforming device to give it thedesiredshape. a

3; The improvement in the art of formingrings having cutting or abradingQfaces,

which. consists in firstproducing the cutting or abrading face upon a flat strip'of material, next heating the material, graspingfit in a' manner which will not injure the teeth and bending it around a forming surface to give it the desired shape, and then securing the ends/of the strip together.

4-. The improvement in the art of produc ing rings having cutting or abrading faces,

which'consists infirst shaping'a flat strip of material so that it can be engaged by the edges,'ne xt producinga' cutting or abrad ing facejon said strip, next-heating the strip,

then securingitat one end to a former. de-'- vice, and finally engaging it by the edges and bending it around the forming device.

5..The lmprovement 1n the art of producing' a ring having a cutting or abrading face, which consists informing said cutting or abradingl face upon a fiat strip of material, heating saidmaterial, securing one end of the strip to a" forming device, and then 7 engaging t 1e 'strip at the edges-to leave the teeth' uninjuredU and bending the strip aroundthe forming deviceto give it shape; r COLIN LOGAN.

Witnesses: V CHAS. W. TEN Eran,

ANNA lV. IB A oHL 

